Fluid-pressure brake.



'PATENTED JAN. 29, 1907.

W. H. SAUVAGE. FLUID PRESSURE BRAKE.

APPLICATION FILED SEPT. 1. 1908.

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A 3 anbe/wtqz PATENTBD JAN. 29, 1967.

W. H. SAUVAGE. FLUID PRESSURE BRAKE.

APPLICATION FILED 8EPT.1.1906.

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1n! NORRIS PETERS co.. WASHINGTON. D c

UNITED STATES PATENT OFFICE.

I WILLIAM HENRY SAUVAGE, OF NEW YORK, N. Y., ASSIGNOR TO SAUVAGE SAFETYBRAKE COMPANY, A CORPORATION OF NEW JERSEY.

FLUID-PRESSURE BRAKE.

Patented Jan. 29, 1907.

-Application filed September 1, 1906. Serial No. 332,889.

To all whom, it may concern:

Be it known that 1, WILLIAM HENRY SAU- VAGE, a citizen of the UnitedStates of America, and a resident of the borough of Manhattan, city,county, and State of New York, have invented certain new and usefulImprovements in Fluid-Pressure Brakes, of which the following isaspecification.

My invention relates to fluid-pressurebrake systems, and consists of animprovement on the apparatus disclosed in my reissued Letters Patent No.12,229, dated June 7, 1904. In the brake system therein described, inwhich the auxiliary cylinder goes into action only after the movement ofthe piston of the main cylinder has begun,

means is of course necessary for causing the movement of the auxiliarypiston to be transmitted to the brake-rigging, but at the same time topermit movements of the brakerigging without causing a movement of theauxiliary piston.

My present invention relates to the improved mechanism for producingsuch action.

The best form of apparatus at present known to me embodying my inventionis illustrated in the accompanying two sheets of drawings, in whichFigure 1 is a plan view of the parts of the standard brake-rigging withthe auxiliary cylinder and my invention attached thereto. Fig. 2 is anenlarged detail sectional view of the telescoping piston-rod, the partsbeing in position assumed just after the piston of the auxiliarycylinder has completed its return stroke; and Fig. 3 is a similar viewshowing the parts in the position assumed while the auxiliary piston ison its outward stroke.

Throughout the drawings like referenceletters'indicate like parts.

A is the main cylinder of the ordinary brake apparatus.

B is an auxiliary cylinder connected to the main cylinder by the pipe O,which enters the main cylinder at a point" five or' six inches from itspressure-head. This auxiliary cylinder B has a telescoping piston-rod,which is formed of the ordinary hollow piston-rod E and the push-rod Finserted therein. This push-rod has a longitudinal slot cut in it, andin this slot is mounted a latch D, pivoted at R to the push-rod. Thislatch has one corner beveled at P, and

nected to the piston of the main cylinder A e by the link K andpiston-rod L. I

M is a fixed stop preferably bolted to the pressure-head Q of theauxiliary cylinder. This stop preferably has a beveled face Ocooperating with the beveled face P on the end of the latch D. e Suchbeing the construction of the apparatus, the operation of my inventionis as follows: When air is admitted to the main cylinder A, the pistonis of course driven out, and motion is transmitted, through link K andauxiliary lever H, to the push-rod F, pulling the same out of the hollowpiston E, but not moving the piston in the auxiliary cylinder. Thepush-rod and the hollow piston-rod form a telescoping piston-rod forsuch auxiliary piston, w ich telescoping piston-rod is capable ofextension in the manner above described. After the parts have moved adistance corresponding to about five inches of travel of the main pistonthe latch D will have been withdrawn from out the hollow piston-rod Eand Will drop down into position shown in Fig. 3. Immediately thereafterair will pass over through pi e C from the main cylinder A to the auxiiary cylinder B, and the piston of the auxiliary cylinder will start tomove out. As soon as it moves the hollow piston E engages the end of thelatch D and carries the push-rod F along with it, transmitting its forcethrough the auxiliary lever H and link K to the main brake-rigging. Whenthe brakes are released, the air will exhaust first from auxiliarycylinder B into main cylinder A, and the piston in the auxiliarycylinder will complete its return stroke. Just before it does so thebeveled face O on the stop will engage the end of latch D and lift sameback into its original position within the slotted portion of thepush-rod, so that push-rod and latch may together be pushed back intothe hollow insure this action of the lever, a projection piston-rod Eduring the return travel of the piston in main cylinder A, all as shownin is the auxiliary lever H is of necessarily limited length, andtherefore swings through quite an arc in the course of a heavy brakeapplication, there is a tendency for it to shove the push-rod to oneside and cause it to bind in the hollow piston E, with the result thatthe complete brake application is prevented or the piston in thecylinder B is pulled out too soon before the latch D has iada chance todrop into position for engagement. To avoid this, the lever is given asliding connection to its fulcrum I by means of a slot J. With thisconstruction the outward movement of the main piston (the auxiliarylever being initially in about-the position shown in Fig. 1) tends tocause the auxiliary lever to slide inward on its fulcrumpin and adjustitself to the proper position before any thrust upon the push-rod F. To

may be formed 011 it in any convenient manner, as by inserting a pin X,which bears againstithelever-guide Y, usually provided for suchauxiliary lever and arranged in a line parallel to the linev of thepiston travel.

The advantages of my invention comprise a compact arrangement of theparts, the fact that they cannot be thrown out of operative relation byany Warping of the car body, and that no jamming of the parts or otherdestructive action is produced by the failure of the latch to work.

Having, therefore, described my invention, I claim 1. In a fluidpressure brake apparatus comprising a main cylinder and an auxiliarycylinder, the auxiliary cylinder going into action after the movement ofthe piston of the main cylinder has begun, the combination of atelescoping piston-rod for said auxiliary cylinder, a latch arranged tohold the telescoping members extended, and means for tripping said latchbefore the piston completes its return stroke, said means comprising afixed dog having a beveled face-located in the line of travel of thelatch.

2. In a fluid-pressure-brake apparatus the combination of a cylinder, apiston having a hollow piston-rod, a push-rod telescoping therein, and alatch pivoted on the push-rod and adapted to engage the outer end of thehollow piston when the push-rod is partly withdrawn therefrom.

3. In a fluid-pressure-brake apparatus the combination of a cylinder, apiston having a hollow piston-rod, a push-rod telescoping therein, and alatch pivoted on the push-rod and adapted to engage the outer end of thehollow piston when the push-rod is partly withdrawn therefrom togetherwith means for tripping said latch when the piston completes its returnstroke.

4. In a fluid-pressure-brake apparatus the combination of a cylinder, apiston having a hollow pistonrod, a push-rod telescoping therein, and alatch pivoted on the push-rod and adapted to engage the outer end of thehollow piston when'the push-rod is partly withdrawn therefrom togetherwith means for tripping said latch when the piston completes its returnstroke, said means comprising a dog fixed to the cylinder-head andengaging said latch.

5. In a fluid pressure -brake apparatus comprising a main cylinder andan auxiliary cylinder, and the usual brake-levers, the combination of anauxiliary lever pivoted at one end to a fixed fulcrum by a slidingconnection, connected at the other end to the piston of the auxiliarycylinder and midway of its length to the piston of the main cylinder, aguide for said auxiliary lever parallel to the line of piston travel,and a projection on said lever engaging the guide.

6. In a fluid-pressurebrake apparatus the combination of a maincylinder, an auxiliary cylinder, the usual system of brakelevers and anauxiliary lever, pivoted at one end to a fixed fulcrum by a slidingconnection, connected at the other end to the piston of the auxiliarycylinder, and intermediate of its length to the piston of the maincylinder.

Signed at New York, N. Y., this 31st day of August, 1906.

lVitnesses E. L. MACUBREY, M. G. CRAWFORD.

